fix(*): export types from package

src/index.ts

@@ -1 +1,2 @@
 export { lint } from './lint'
+export * from './types'

src/types/index.ts

@@ -0,0 +1,5 @@
+export * from './Diagnostic'
+export * from './LintConfig'
+export * from './LintRule'
+export * from './LintRuleType'
+export * from './Severity'